, the fbi knewabouttamerlantsarnaevas far back as 2011. and can anything be done to prevent these kinds of attacks in a free society? tony used priceline to book this 4 star hotel. tell 'em why. free breakfast with express deals, you can save big and find a hotel with free breakfast without bidding. don't you just love those little cereal boxes? priceline savings without the bidding. >>> live from america's news headquarters i'm marianne rafferty. those who live near the site of a deadly fertilizer plant explosion in west, texas being allowed home if they he still have a home to return to. wednesday night's blast leveled dozens of houses and killed at least 14 people and injured nearly 200 others. a city spokes person saying leaking gas tanks triggered new you fires at the site. >>> the midwest dealing with severe floods after a week of heavy rain. the national weather service predicting major flooding on the mississippi river for the weekend. the areas in the most immediate danger include the quad-cities to just north of st. louis. >>> and the magglioty nude 6.6 earthquake in southwest

questions in the boston marathon bombing. what was the motive? the f.b.i. says itinterviewedtamerlantsarnaevin 2011 after being told by a foreign government, reportedly russia, he had become a follower of riradical islam. they found no evidence of terrorist activity at that time. did the chech anyian brothers act alone or was it a broughter plan with coconspiracies in the u.s. or overseas? wayne simmons, a former c.i.a. analyst and joins us now with some insight. thank you for coming in today. >> always a pleasure. >> i want to ask you about this. the way that the bombs they use have had been described, you know, many law enforcement sources said they were too sophisticated for somebody who was going to google and throw something together that the brothers had to have training at some point. for what they are accused of doing. what do you make of that? >> all of us, first of all, those agree that nothing today is 100% certain. that is where we need to start. if i had to make a guess, i would remind guys like me that 12 years ago, 13 years ago the chechens were in afghanistan trying